POWER COSMIC BLEEDING THROUGH ENCHANTED URU: Thor has an additional target for each Power Cosmic token he has. // When Thor hits 3 or more characters, instead of normal damage, each hit target is dealt damage equal to his printed damage value.

If I gave Thor pulse wave and I hit 3 or more targets would his trait trigger and do 5 damage to each target?

Let's pull up some relevant text here first, just so it's all in one place:

Looking at the above rules and clarification from this post on the rules forum, once you activate Pulse Wave as an action you are locked into its non-optional "instead of normal damage" effect of dealing 1 damage. Thor's effect would not be applied.

Note that this would also apply if you attempted to use Energy Explosion:

Ok but Thor's power is not stated as optional.
what gives priority to pulsewaves damage ?

Because you activated an action (Pulse Wave) that includes a non-optional "instead of normal damage" effect. Thor's power is not an action, but is instead a triggered effect that comes later and therefore has lower "priority", so to speak.

I included the the relevant rules in my last post.